| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | he [vb mod] to know | 24 |
|
| 2 | he [modal v] to know | 23 |
|
| 3 | he ought to know | 17 |
|
| 4 | he ought to know | 17 |
|
| 5 | he used to know | 7 |
|
| 6 | he used to know | 7 |
|
